Cyclical Deformations of Quadrangles in <em>S</em><sub><em>κ</em></sub><sup>2</sup> and Defining Properties of Alexandrov Spaces

中国科学院数学与系统科学研究院期刊网

Cyclical Deformations of Quadrangles in S_κ² and Defining Properties of Alexandrov Spaces

Qing Song CAI

Acta Mathematica Sinica . 2021, (4): 597 -640 . DOI: 10.1007/s10114-021-9462-1